updated css

app.py

@@ -40,7 +40,7 @@ demo = gr.Blocks()
 css = """
 footer {display:none !important}
 .output-markdown{display:none !important}
-btn.primary {
+button.primary {
     z-index: 14;
     height: 43px;
     width: 130px;
@@ -60,7 +60,7 @@ btn.primary {
     transition: box-shadow 200ms ease 0s, background 200ms ease 0s !important;
     box-shadow: none !important;
 }
-btn.primary:hover{
+button.primary:hover{
     z-index: 14;
     height: 43px;
     width: 130px;